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what hap when alcohol heated under reflux with KBr and 50% sulf acid?
HBr produced.
reacts with alcohol form bromoalkane,+water.
acid used 50% conc PREVENT HBR PRODUUCED BEING OXIDISED BY ACID TO BROMINE.

Warming mixture of damp RED PHOSPHURUS and I makes?
phosphorus triiodide.
then reacts with alcohol to form iodoalkane and phosphorus(III) ACID .
MOSITURE TO BRING iodine and P in CONTACT . both SOLID.